... 1) Voltage: DC 24V, AC110V, 220V 2) multilayer constructions 3) sound type : message ,sound ,alarm... 4) Certificate: CE, CCC Multi-signal lamp, ... of life, not change the light bulbs, set alarm sound and flashing alarm as a whole can also be ... and attractive appearance, low price.Main technical parametersSound way: Sound signal, alarm sound, musicRated voltage: DC12V, 24V, AC110V, 220V.Operating ...